// Copyright (c) 2018, Yubico AB
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

package com.yubico.webauthn;

import com.yubico.webauthn.data.ByteArray;
import com.yubico.webauthn.data.TokenBindingInfo;
import java.util.Optional;


final class TokenBindingValidator {

    static boolean validate(Optional<TokenBindingInfo> clientTokenBinding, Optional<ByteArray> rpTokenBindingId) {
        return rpTokenBindingId.map(rpToken ->
            clientTokenBinding.map(tbi -> {
                switch (tbi.getStatus()) {
                    case SUPPORTED:

                    case PRESENT:
                        return tbi.getId().map(id -> {
                            if (id.equals(rpToken)) {
                                return true;
                            } else {
                                throw new IllegalArgumentException("Incorrect token binding ID.");
                            }
                        }).orElseThrow(() -> new IllegalArgumentException("Property \"id\" missing from \"tokenBinding\" object."));
                }
                throw new RuntimeException("Unknown token binding status: " + tbi.getStatus());
            }).orElseThrow(() -> new IllegalArgumentException("Token binding ID set by RP but not by client."))
        ).orElseGet(() ->
            clientTokenBinding.map(tbi -> {
                switch (tbi.getStatus()) {
                    case SUPPORTED:
                        return true;

                    case PRESENT:
                        throw new IllegalArgumentException("Token binding ID set by client but not by RP.");
                }
                throw new RuntimeException("Unknown token binding status: " + tbi.getStatus());
            }).orElse(true)
        );
    }

}
